Building steel bar containing V, Ti and Cr microalloys as well as LF (ladle furnace) production method of building steel bar

• Main Authors: ZHAO ZHIQIANG, GUO YUEHUA, DENG TONGWU, LIU MING
• Format: Patent
• Language: Chinese; English
• Published: 23.03.2018
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention belongs to the field of iron and steel metallurgy, and particularly relates to a building steel bar containing V, Ti and Cr microalloys as well as an LF (ladle furnace) production methodof the building steel bar. In order to solve the problems that vanadium nitride alloys selected for the preparation of nitrogen alloy steel are low in nitrogen content, and the types of the vanadiumnitride alloys are less, the building steel bar and the LF production method are provided. The building steel bar comprises the following components in percentage by weight: 0.15-0.30% of C, 0.30-1.00% of Si, 0.60-1.30% of Mn, 0.0060-0.0180% of N, not more than 0.040% of P, not more than 0.040% of S, 0.010-0.100% of V, 0.010-0.030% of Ti, 0.10-060% of Cr, and the balance Fe and inevitable impurities. The key of a method for preparing the building steel bar is to feed a nitrogen-containing cored wire into a steel ladle after LF refining so as to adjust the nitrogen content to an appropriate level; the LF production meth